Sony VGN-N100 - Manual (Page 117)

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Troubleshooting
Battery
How do I find the battery charging status?
See Charging the Battery Pack (page 21) .
When is my computer using AC power?
When your computer is directly connected to the AC adapter, it uses AC power, even if the battery pack is installed.
When should I recharge the battery pack?
❑ When the battery level falls below 10 percent.
❑ When both the battery and power indicators blink.
❑ When you have not used the battery pack for a long period of time.
When should I replace the battery pack?
If the battery power is still low after charging it, the battery pack may be reaching the end of its life and should be replaced.
Should I be concerned that the installed battery pack is warm?
No, it is normal for the battery pack to be warm when it is powering your computer.